PERMA/FLO

metal pipes and metal pipe fittings as abrasive resistant parts for pneumatic conveying of abrasive materials, but specifically excluding such goods as used in the conveyance of liquids in the oil well field of endeavor

rotary valves, mechanized feeders, and airlocks, all as machine parts for pneumatic conveying of abrasive materials; diverters, namely, diverter valves as machine parts for pneumatic conveying of abrasive materials, but specifically excluding such goods as used in the conveyance of liquids in the oil well field of endeavor